I think it's more that there's less pressure on females than males for sexual experimentation. It's considered within femininity to have lesbian experiments and for a girl that's supposed to be feminine, then that's ok. But for men to have gay experiments are considered effeminate, along with other social stigmas, so maybe that's why you don't hear about them, nor do they occur.
I mean, while there's the butch image of a lesbian, lesbianism has been pretty glorified by the media and porn industry. And there seems to be more negative attention towards gays (referring to males) than gays (females).